Related Party Transactions - Schedule of due to Affiliated entities (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Due to affiliates	$ 3,300	$ 5,925
Due to affiliate, carried at fair value	485	496
HSBC Private Banking Holdings (Suisse) S.A and subsidiaries [Member]
Related Party Transaction [Line Items]
Due to affiliates	0	500
HSBC USA, Inc. [Member]
Related Party Transaction [Line Items]
Due to affiliates	2,500	3,012
HSBC Holdings plc [Member]
Related Party Transaction [Line Items]
Due to affiliates	800	813
HSBC North America [Member]
Related Party Transaction [Line Items]
Due to affiliates	$ 0	$ 1,600